Improvement in machines for forming sheet-metal window-caps



R. A. SMITH.

Machines fur forming Sheet-Metal Window-Caps. No,l4,7,-184-PatentedFb.a.1-s74.

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% l @y gaa/ff, v @En UNITED STATES PATENT OFFICE.

ROLLIN A. SMITH, OF FOND DU LAC, VISCONSIN.

IMPROVEMENT IN MACHINES FOR FORMING SHEET-METAL WINDOW-CAPS.

Specification forming part of Letters Patent No. 147,184, dated February3, 1874; application filed January 5, 1874.

l Fond du Lac, in the county of Fond du Lac and State of ldisconsin,have invented cerf tain Improvement-s in Machines for FormingSheet-Metal Window-Caps, of which the following is a specification:

My invention relates to a machine for forming sheet-metal window-caps,&c.; and consists in a trip-hammer provided with dies to shape themetal, and with a spring and treadle, by which the force of the blowsmay be varied, as required.

Figure l is a perspective view of the machine; Fig. 2, aplan or faceview of one of the dies.

A represents a horizontal hammer beam or handle, pivoted, at a, in astandard, B, with its end extending 'beyond or in rear of the pivot. Cis au anvil to support the work, and receive the blows of the hammer. Dis a horizontal shaft, having a crank, b, and iiy-wheel E. The shaft ismounted in suitable bearings, and is so arranged that at each revolutionits crank b, acting on the rear end of the beam A, tips the hammer up,and

then, slipping otf the end of the beam, allows the hammer to drop on theanvil. F and Gr are male and female dies, of the form of the requiredmolding or cornice, secured, one to the hammer and the other to theanvil, so that when the hammer drops they tit into each other. His aspring, having its upper side secured to the hammer-beam A near itsfulpressing the foot-lever more or less, the force of its blow may bevaried, as required.

It is intended to use .the machine mainly for forming curved windowcaps.In such case the dies are made of a curvature correspondf ing to that ofthe caps, which should have their curvature regular or uniform from endto end.

In operating the machine, it is kept constantly in motion. The operator,standing by the sideof the anvil, takes a piece of sheet metal, cut ofthe proper form 0r curvature, and, placing it on the anvil, slides itback and forth thereon, so that the die on the hammer will act upon itsentire surface from one end to the other, Aand bend it to conform withthe lower die. When the metal first commences to bend, the blows shouldbe light; but as the operation progresses the operator should depressthe treadle and increase the force of the blows, in order to form orshape the metal to all the minute details of the dies.

The dies will be attached to the hammer and anvil by bolts or otherfastenin gs, .which will 'permit them to be quickly and easily detachedand replaced by others of a different form. l make the dies of anysuitable metal, cast from patterns of plaster-of-paris. These patternsare made by taking a thin plate, which has its edge shaped to correspondwith the sectional form of the molding, attaching said plate to the endof a pivoted bar or arm, and sweeping it over the plastic material.

By means of my machine, constructed and operating as above, I am enabledto form sheet-metal window`caps, cornices, Sac., with great rapidity,cheapness, and neatness. V

Having thus described my invention, what I claim is- Theherein-described improved machine for forming sheet-metal window-caps,consisting of the stationary die G, hammer-beam A, provided with the dieF, spring H, and treadle J. constructed and arranged substantially asshown.

ROLLIN A. SMITH.

Titnesses F. D. J oNEs, H. J. HOPKINS.

